I am seeing the same issue. We have RPF data (1000 300kb images) that is slow to render with ImageMosaic at far zoomed out levels.
Can we use controlFlow extension to block any rendering that takes more than X seconds? I have tried control flow with timeout=10 and also GeoServer WMS configuration "max rendering time"=10seconds. Neither seem to work but maybe it's because I am just constantly sending in too many requests (from my CesiumJS client map). Any advice? Thank you! Rahkonen Jukka (Tike) wrote > Hi, > > There has been a lot of discussion about raster image performance on UMN > Mapserver user list. The situation with Geoserver is mostly the same so I > believe making a search on Mapserver archive would be useful for you. > Briefly, you should first have a look at your imagery and think about what > happens with it at different zoom levels. Your main problem is with the > far-away zoom levels, and in that case the main reason for the slow > response can not be removed by making overviews for individual images. > When you have zoomed out very far, the server must open many physical > image files to fill in the requested window. Having images with overviews > do help in getting out the low-resolution version of each file that must > be opened, but just accessing the files on a disk system for reading can > take most of time. The key to speed in this case is to create a separate > physical low resolution overview image that is covering larger area or > perhaps the whole image layer. Then it will be enough to open just one > image file and it will be much faster. When the user has zoomed in so > close that the resolusion of the overview image is not good enough the > system should be configured to switch to use the original high resolution > images through image mosaic. Because the requested area is not so large > anymore, it will be enough to access just a few images on disk. This way > you might get 2 second response time at each zoom level. That is not > especially good timing for my mind either, but if you are measuring times > to get single requests visible on screen with browser it is a bit > difficult to say if there is something strange in the chain between your > Geoserver and browser. Making for example a hundred request with changing > bounding boxes with wget or some performance monitor program like jmeter > would give more accurate results. > > Your images are also rather small as geospatial images, and they could be > mosaiced even all together into one single 2 gigabyte Geotiff file with > internal overviews. By doing so the performance should be good without > having to create two image layers and scale dependent switching system > between them. > > -Jukka Rahkonen- > > ________________________________ > > Lähettäjä: > geoserver-users-bounces@.sourceforge > [mailto: > geoserver-users-bounces@.sourceforge > ] Puolesta Paul McCullough > Lähetetty: 7. joulukuuta 2007 21:32 > Vastaanottaja: > geoserver-users@.sourceforge > Kopio: > geoserver-users@.sourceforge > ; > geoserver-users-bounces@.sourceforge > Aihe: Re: [Geoserver-users] image mosaic performance > > > > > All, > > Following suggestions I have tried the following. > - translated my tiffs to geotiffs (gdal_translate -of GTiff inFile > outFile) > - built overviews on the geotiffs (gdaladdo -r average file.tif 2 4 8 > 16) > - file size increased from 5.8mb to 7.9mb (about 250 files) > - rebuild the index shapefile > - completely recreate the image mosaic in geoserver > > RESULTS > A minor improvement; I was hoping for more. > Rendering speeds at the browser: > scale time > 1:8K 10s > 1:4K 10s > 1:2K 6s > 1:1K 2s > > PREVIOUS RESULTS > secs secs > to to > render render > scale raster vector > 1:6000 15 3 > 1:3000 15 3 > 1:1500 5 3 > 1:800 3 2 > 1:400 3 2 > 1:200 2 2 > > Did I build the overviews properly (with the correct parms?) > Any recomendations on my next step? > > Thanks > Paul > > > > ------------------------------------------------------------------------- > SF.Net email is sponsored by: > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://sourceforge.net/services/buy/index.php > _______________________________________________ > Geoserver-users mailing list > Geoserver-users@.sourceforge > https://lists.sourceforge.net/lists/listinfo/geoserver-users -- Sent from: http://osgeo-org.1560.x6.nabble.com/GeoServer-User-f3786390.html _______________________________________________ Geoserver-users mailing list Please make sure you read the following two resources before posting to this list: - Earning your support instead of buying it, but Ian Turton: http://www.ianturton.com/talks/foss4g.html#/ - The GeoServer user list posting guidelines: http://geoserver.org/comm/userlist-guidelines.html If you want to request a feature or an improvement, also see this: https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer Geoserver-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geoserver-users
